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JSON Formatter & Validator
Validate JSON syntax, format with two-space indentation or minify into one line locally.
Processed on your device · No file uploads
Your selected files and results are processed on this device. They are not sent to external servers or stored on our servers.
How processing works- 01Select input
- 02Process locally
- 03Review & save
Loading the tool. JavaScript is required.
How to use JSON Formatter & Validator
- 01Enter text or choose your files.
- 02Enter JSON and choose Indent or Minify to validate and format it.
- 03Review the result, then copy or download it.
Frequently asked questions
Are my inputs stored on a server?
No. Tool inputs, files and results are processed locally without uploading or storing them on our servers.
What are the limits?
Up to 100,000 characters. Large integers may lose JavaScript precision, and duplicate keys keep the last value. Comments and JSON5 are unsupported.
How does this tool work?
Enter JSON and choose Indent or Minify to validate and format it.
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